Segment Information (Tables)

3 Months Ended

Mar. 31, 2018

Segment Reporting Information, Revenue for Reportable Segment [Abstract]

Reconciliation Of Sales To Earnings Before Income Taxes by Segment

The following table illustrates certain measurements used by management to assess performance of the segments described above for the three months ended March 31, (in thousands):

	Three Months Ended   March 31,
	2018			2017
Net sales:
Residential Products	$	103,948		$	104,551
Industrial and Infrastructure Products	54,624			50,718
Less: Intersegment sales	(221		)	(456		)
Net Industrial and Infrastructure Products	54,403			50,262
Renewable Energy and Conservation	56,986			51,792
Total consolidated net sales	$	215,337		$	206,605
Income from operations:
Residential Products	$	13,238		$	15,641
Industrial and Infrastructure Products	2,602			(37		)
Renewable Energy and Conservation	4,062			3,340
Unallocated Corporate Expenses	(6,059		)	(9,265		)
Total income from operations	$	13,843		$	9,679

Disaggregation of Revenue

The following tables illustrate revenue disaggregated by timing of transfer of control to the customer for the three months ended March 31 (in thousands):

	Three Months Ended March 31, 2018
	Residential Products		Industrial and Infrastructure Products		Renewable Energy and Conservation		Total
Net sales:
Point in Time	$	102,884	$	46,543	$	5,620	$	155,047
Over Time	1,064		7,860		51,366		60,290
Total	$	103,948	$	54,403	$	56,986	$	215,337

	Three Months Ended March 31, 2017
	Residential Products		Industrial and Infrastructure Products		Renewable Energy and Conservation		Total
Net sales:
Point in Time	$	104,551	$	50,262	$	5,793	$	160,606
Over Time	—		—		45,999		45,999
Total	$	104,551	$	50,262	$	51,792	$	206,605